Mattern Maximilian, Pudell Jan-Etienne, Dumesnil Karine, von Reppert Alexander, Bargheer Matias
Institut für Physik & Astronomie, Universität Potsdam, 14476 Potsdam, Germany.
European XFEL, 22869 Schenefeld, Germany.
Photoacoustics. 2023 Feb 17;30:100463. doi: 10.1016/j.pacs.2023.100463. eCollection 2023 Apr.
Using time-resolved x-ray diffraction, we demonstrate the manipulation of the picosecond strain response of a metallic heterostructure consisting of a dysprosium (Dy) transducer and a niobium (Nb) detection layer by an external magnetic field. We utilize the first-order ferromagnetic-antiferromagnetic phase transition of the Dy layer, which provides an additional large contractive stress upon laser excitation compared to its zero-field response. This enhances the laser-induced contraction of the transducer and changes the shape of the picosecond strain pulses driven in Dy and detected within the buried Nb layer. Based on our experiment with rare-earth metals we discuss required properties for functional transducers, which may allow for novel field-control of the emitted picosecond strain pulses.
通过时间分辨X射线衍射，我们展示了利用外部磁场对由镝（Dy）换能器和铌（Nb）检测层组成的金属异质结构的皮秒应变响应进行操控。我们利用了Dy层的一级铁磁-反铁磁相变，与零场响应相比，该相变在激光激发时会产生额外的大收缩应力。这增强了换能器的激光诱导收缩，并改变了在Dy中驱动并在埋入的Nb层中检测到的皮秒应变脉冲的形状。基于我们对稀土金属的实验，我们讨论了功能性换能器所需的特性，这可能允许对发射的皮秒应变脉冲进行新型场控制。
